Ever wondered what would happen with a filled with water plastic bag if you pierced it with a pencil? It should be alright as long as you leave the pencil in it.
If you want to know why the bag doesn’t leak, please read explanation below
Most of plastic bags are made out of polymers with flexible chains of molecules. When the pencil goes through the bag, the stretchy plastic hugs around it, creating a watertight seal and the bag doesn’t leak.